using Community.CsharpSqlite.Entity;

namespace Community.CsharpSqlite
{
    public partial class Sqlite3
    {
        /*
    ** 2008 Jan 22
    **
    ** The author disclaims copyright to this source code.  In place of
    ** a legal notice, here is a blessing:
    **
    **    May you do good and not evil.
    **    May you find forgiveness for yourself and forgive others.
    **    May you share freely, never taking more than you give.
    *************************************************************************
    **
    ** This file contains code to support the concept of "benign"
    ** malloc failures (when the xMalloc() or xRealloc() method of the
    ** sqlite3_mem_methods structure fails to allocate a block of memory
    ** and returns 0).
    **
    ** Most malloc failures are non-benign. After they occur, SQLite
    ** abandons the current operation and returns an error code (usually
    ** StatusCode.SQLITE_NOMEM) to the user. However, sometimes a fault is not necessarily
    ** fatal. For example, if a malloc fails while resizing a hash table, this
    ** is completely recoverable simply by not carrying out the resize. The
    ** hash table will continue to function normally.  So a malloc failure
    ** during a hash table resize is a benign fault.
    *************************************************************************
    **  Included in SQLite3 port to C#-SQLite;  2008 Noah B Hart
    **  C#-SQLite is an independent reimplementation of the SQLite software library
    **
    **  SQLITE_SOURCE_ID: 2009-12-07 16:39:13 1ed88e9d01e9eda5cbc622e7614277f29bcc551c
    **
    **  $Header: Community.CsharpSqlite/src/fault_c.cs,v bcbd36f24b23 2010/02/18 17:35:24 Noah $
    *************************************************************************
    */
        //#include "sqliteInt.h"

#if !SQLITE_OMIT_BUILTIN_TEST
        /*
** Global variables.
*/
        //typedef struct BenignMallocHooks BenignMallocHooks;
        public struct BenignMallocHooks //
        {
            public void_function xBenignBegin; //void (*xBenignBegin)(void);
            public void_function xBenignEnd; //void (*xBenignEnd)(void);

            public BenignMallocHooks(void_function xBenignBegin, void_function xBenignEnd)
            {
                this.xBenignBegin = xBenignBegin;
                this.xBenignEnd = xBenignEnd;
            }
        }

        private static readonly BenignMallocHooks sqlite3Hooks = new BenignMallocHooks(null, null);

        /* The "wsdHooks" macro will resolve to the appropriate BenignMallocHooks
    ** structure.  If writable static data is unsupported on the target,
    ** we have to locate the state vector at run-time.  In the more common
    ** case where writable static data is supported, wsdHooks can refer directly
    ** to the "sqlite3Hooks" state vector declared above.
    */
#if SQLITE_OMIT_WSD
//# define wsdHooksInit \
BenignMallocHooks *x = &GLOBAL(BenignMallocHooks,sqlite3Hooks)
//# define wsdHooks x[0]
#else
        //# define wsdHooksInit
        private static void wsdHooksInit()
        {
        }

        //# define wsdHooks sqlite3Hooks
        private static BenignMallocHooks wsdHooks = sqlite3Hooks;
#endif


        /*
** Register hooks to call when sqlite3BeginBenignMalloc() and
** sqlite3EndBenignMalloc() are called, respectively.
*/

        private static void sqlite3BenignMallocHooks(
            void_function xBenignBegin, //void (*xBenignBegin)(void),
            void_function xBenignEnd //void (*xBenignEnd)(void)
            )
        {
            wsdHooksInit();
            wsdHooks.xBenignBegin = xBenignBegin;
            wsdHooks.xBenignEnd = xBenignEnd;
        }

        /*
    ** This (sqlite3EndBenignMalloc()) is called by SQLite code to indicate that
    ** subsequent malloc failures are benign. A call to sqlite3EndBenignMalloc()
    ** indicates that subsequent malloc failures are non-benign.
    */

        public static void sqlite3BeginBenignMalloc()
        {
            wsdHooksInit();
            if (wsdHooks.xBenignBegin != null)
            {
                wsdHooks.xBenignBegin();
            }
        }

        public static void sqlite3EndBenignMalloc()
        {
            wsdHooksInit();
            if (wsdHooks.xBenignEnd != null)
            {
                wsdHooks.xBenignEnd();
            }
        }
#endif
        //* SQLITE_OMIT_BUILTIN_TEST */
    }
}